00612naa#a2200181#i#450# EN\\bibl\115853 20260311111632.3 2782-4586 20260131b2026####ek#y0engy0150####ca RU The specifics of marketing activities and services in a private security company Journal article Moscow ITBO University 2026 4 с. Journal article local Сбыт. Продажа. Реализация продукции. 658.8 Kryuchkov Semen Aleksandrovich Vil'danova Lyaysan Valer'evna jomeam.ru